US PATENT SUBCLASS 208 / 252
.~.~ With acid
Current as of:
June, 1999
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208 /
HD
MINERAL OILS: PROCESSES AND PRODUCTS
177
DF
REFINING
{23}
251 R
DF
.~ Metal contaminant removal {3}
252
.~.~ With acid
DEFINITION
Classification: 208/252
(under subclass 251) Processes wherein an acid is employed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
90, for processes of acid refining of mineral oil combined with subsequent chemical conversion.
98, for processes of chemical conversion of mineral oil combined with acid refining a product thereof.
219+, for processes of desulfurization of mineral oils with acids.
256, for processes removing gum or gum formers with acids. 265+, for other processes of refining of mineral oils with acids.
